Add helloworld.proto and re-generate files

[lucacome]

Adds helloworld.proto and regenerates files.

[codecov-commenter]

Codecov Report

Merging #3091 (4e9a3a7) into main (23be85f) will decrease coverage by 0.02%.
The diff coverage is 45.45%.

❗ Current head 4e9a3a7 differs from pull request most recent head f214528. Consider uploading reports for the commit f214528 to get more accurate results

@@            Coverage Diff             @@
##             main    #3091      +/-   ##
==========================================
- Coverage   52.31%   52.28%   -0.03%     
==========================================
  Files          58       58              
  Lines       15995    16006      +11     
==========================================
+ Hits         8368     8369       +1     
- Misses       7350     7358       +8     
- Partials      277      279       +2     

Impacted Files	Coverage Δ
cmd/nginx-ingress/flags.go	34.42% <ø> (ø)
cmd/nginx-ingress/main.go	0.00% <0.00%> (ø)
internal/configs/config_params.go	76.74% <ø> (ø)
internal/configs/version1/config.go	0.00% <ø> (ø)
internal/configs/version2/http.go	0.00% <ø> (ø)
internal/k8s/controller.go	11.10% <0.00%> (-0.02%)	⬇️
internal/configs/configmaps.go	20.37% <100.00%> (+0.16%)	⬆️
internal/configs/transportserver.go	93.81% <100.00%> (+0.03%)	⬆️
internal/configs/virtualserver.go	95.22% <100.00%> (+<0.01%)	⬆️
internal/k8s/configuration.go	95.39% <100.00%> (-0.37%)	⬇️
... and 1 more

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